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- menu "Newlib"
- choice NEWLIB_STDOUT_LINE_ENDING
- prompt "Line ending for UART output"
- default NEWLIB_STDOUT_LINE_ENDING_CRLF
- help
- This option allows configuring the desired line endings sent to UART
- when a newline ('\n', LF) appears on stdout.
- Three options are possible:
- CRLF: whenever LF is encountered, prepend it with CR
- LF: no modification is applied, stdout is sent as is
- CR: each occurence of LF is replaced with CR
- This option doesn't affect behavior of the UART driver (drivers/uart.h).
- config NEWLIB_STDOUT_LINE_ENDING_CRLF
- bool "CRLF"
- config NEWLIB_STDOUT_LINE_ENDING_LF
- bool "LF"
- config NEWLIB_STDOUT_LINE_ENDING_CR
- bool "CR"
- endchoice
- choice NEWLIB_STDIN_LINE_ENDING
- prompt "Line ending for UART input"
- default NEWLIB_STDIN_LINE_ENDING_CR
- help
- This option allows configuring which input sequence on UART produces
- a newline ('\n', LF) on stdin.
- Three options are possible:
- CRLF: CRLF is converted to LF
- LF: no modification is applied, input is sent to stdin as is
- CR: each occurence of CR is replaced with LF
- This option doesn't affect behavior of the UART driver (drivers/uart.h).
- config NEWLIB_STDIN_LINE_ENDING_CRLF
- bool "CRLF"
- config NEWLIB_STDIN_LINE_ENDING_LF
- bool "LF"
- config NEWLIB_STDIN_LINE_ENDING_CR
- bool "CR"
- endchoice
- config NEWLIB_NANO_FORMAT
- bool "Enable 'nano' formatting options for printf/scanf family"
- default y if IDF_TARGET_ESP32C2
- help
- ESP32 ROM contains parts of newlib C library, including printf/scanf family
- of functions. These functions have been compiled with so-called "nano"
- formatting option. This option doesn't support 64-bit integer formats and C99
- features, such as positional arguments.
- For more details about "nano" formatting option, please see newlib readme file,
- search for '--enable-newlib-nano-formatted-io':
- https://sourceware.org/newlib/README
- If this option is enabled, build system will use functions available in
- ROM, reducing the application binary size. Functions available in ROM run
- faster than functions which run from flash. Functions available in ROM can
- also run when flash instruction cache is disabled.
- If you need 64-bit integer formatting support or C99 features, keep this
- option disabled.
- choice NEWLIB_TIME_SYSCALL
- prompt "Timers used for gettimeofday function"
- default NEWLIB_TIME_SYSCALL_USE_RTC_HRT
- help
- This setting defines which hardware timers are used to
- implement 'gettimeofday' and 'time' functions in C library.
- - If both high-resolution (systimer for all targets except ESP32)
- and RTC timers are used, timekeeping will continue in deep sleep.
- Time will be reported at 1 microsecond resolution.
- This is the default, and the recommended option.
- - If only high-resolution timer (systimer) is used, gettimeofday will
- provide time at microsecond resolution.
- Time will not be preserved when going into deep sleep mode.
- - If only RTC timer is used, timekeeping will continue in
- deep sleep, but time will be measured at 6.(6) microsecond
- resolution. Also the gettimeofday function itself may take
- longer to run.
- - If no timers are used, gettimeofday and time functions
- return -1 and set errno to ENOSYS.
- - When RTC is used for timekeeping, two RTC_STORE registers are
- used to keep time in deep sleep mode.
- config NEWLIB_TIME_SYSCALL_USE_RTC_HRT
- bool "RTC and high-resolution timer"
- select ESP_TIME_FUNCS_USE_RTC_TIMER
- select ESP_TIME_FUNCS_USE_ESP_TIMER
- config NEWLIB_TIME_SYSCALL_USE_RTC
- bool "RTC"
- select ESP_TIME_FUNCS_USE_RTC_TIMER
- config NEWLIB_TIME_SYSCALL_USE_HRT
- bool "High-resolution timer"
- select ESP_TIME_FUNCS_USE_ESP_TIMER
- config NEWLIB_TIME_SYSCALL_USE_NONE
- bool "None"
- select ESP_TIME_FUNCS_USE_NONE
- endchoice
- endmenu # Newlib
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